Vacuum tank trailer



FIG. 1 is an isometric view showing my new design.

FIG. 2 is a front end elevation view.

FIG. 3 is a right side elevation view.

FIG. 4 is a top elevation view.

FIG. 5 is a bottom elevation view.

FIG. 6 is a left side elevation view; and,

FIG. 7 is a back elevation view.

In the drawings, the broken lines show a human figure that forms no part of the claimed design. 

I claim the ornamental design for a vacuum tank trailer, as shown. 